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Chuck, a few "DIR" tips;

Remember no metal-to-metal connections on any gear. For manual pressure gauge, tie a piece of nylon cord around the fitting at the gauge head, then tie nylon to stainless snap swivel. In the event gage becomes entangled nylon cord can be severed.

I use backup reg (NOT "Octopus" or "safe second") on short hose with a piece of surgical tubing run through the exhaust port, surgical tubing goes around my neck. Primary reg has a seven foot hose, looped twice. Why a long hose? So your buddy can use it when he runs out of air during a penetration. Why long hose on the primary? Because that's the one your buddy is going to GRAB OUT OF YOUR MOUTH in a low air situation. You then lower your chin and pick up the backup and begin controlled ascent.

If Crocodile Dundee/Navy SEAL/Jonny Quest knife makes you feel more confident OK, but a pair of EMT snips is a hell of a lot more useful, weighs less and you can't accidentally stick yourself with it.

What's the story with the bad air in Mex?

Man you are going to have a great time, I am looking forward to photos upon your return. Be safe and have fun Chuck!